/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package it.univaq.iw.jweb;


import it.univaq.iw.jweb.data.DataAccess;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.SQLException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author stefano
 */
public class ProcessFoto extends HttpServlet {

    private DataAccess da;

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);

        da = DataAccess.getInstance();
    }
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

        response.setContentType("image/jpg");
        OutputStream sos = response.getOutputStream();
        
        try {

            int idCurr = Integer.parseInt(request.getParameter("id"));
            Blob fotoBlob = da.getFoto(idCurr);
  
            try {

                byte[] buffer = new byte[1024];

                InputStream ins = fotoBlob.getBinaryStream();

                int nread;
                while ((nread = ins.read(buffer)) > 0) {
                    
                    sos.write(buffer, 0, nread);
                }

                ins.close();
                sos.flush();

            } catch (SQLException ex) {
                
                throw new ServletException("Errore nel reperire la foto.", ex);
            }

        } finally {
            
            sos.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
